Fix Arch Linux plexhometheater-git PKGBUILD - Use ffmpeg-compat (until plexhometheater supports ffmpeg 1.2+) plex/CMakeModules/PlatformConfigPOSIX.cmake defines USE_EXTERNAL_FFMPEG, which means that the system-wide ffmpeg is used rather than the version in lib/ffmpeg in the src repo. As of commit f227226bae (08/09/2013), plexhometheater must be …